any single written sentence has its room for interpretation based on the way it is written, and a reader’s comprehension skill, literature level and past experience.
Once it is via verbal communication:
a speaker, in majority scenarios, in order to make his/her spoken language expressive enough, utilizes various tone of voice, pauses and stresses depending on the situation, the environment, the mood and the intention of the speaker at the moment of communicating.
You've just provided the great examples for people to experience the difference of expressions.
